FINETOO6 Pack Seamless Thongs for Women Breathable Tangas Underwear No Show Strings Comfortable Thongs Panties Invisible Hipster XS-XL

Are these hand wash only as in description? Has anyone machine washed them?

I’m a size 6/8 what size shall I order

Does these thongs have a cotton crotch? I see it says polyester and other materials but no cotton. The gussett should be cotton. Please let me know.

I am size 10 so what size thongs ?